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‎AddTimes.java

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package date;
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import java.util.Scanner;
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/**
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*
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* @author Rohit Agarwal
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* @category Date and Time
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* @problem How to add two given times in java?
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*
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*/
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public class AddTimes {
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public static void main(String[] args) {
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Scanner input = null;
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try {
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input = new Scanner(System.in);
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System.out.println("Enter first time(24 hour) in HH:mm:ss format");
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String time1 = input.next();
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System.out.println("Enter second time(24 hour) in HH:mm:ss format");
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String time2 = input.next();
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if (isTimeValid(time1) && isTimeValid(time2)) {
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// Separating first String using delimiter ":"
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String[] firstTimeParts = time1.split(":");
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// Converting String to Integer
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int hours1 = Integer.parseInt(firstTimeParts[0]);
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int minutes1 = Integer.parseInt(firstTimeParts[1]);
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int seconds1 = Integer.parseInt(firstTimeParts[2]);
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// Separating second String using delimiter ":"
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String[] secondTimeParts = time2.split(":");
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// Converting String to Integer
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int hours2 = Integer.parseInt(secondTimeParts[0]);
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int minutes2 = Integer.parseInt(secondTimeParts[1]);
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int seconds2 = Integer.parseInt(secondTimeParts[2]);
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int hours = hours1 + hours2;
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int minutes = minutes1 + minutes2;
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int seconds = seconds1 + seconds2;
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int days = 0;
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/**
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*
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* 60 seconds=1 minute. So if value of seconds>59 adding 1
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* minute to minutes. 60 minutes=1 hour So if value of
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* minutes>59 adding 1 hour to hours. 24 hours=1 day So if value
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* of hours>23 adding 1 day to days.
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*
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*/
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if (seconds > 59) {
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seconds = seconds - 60;
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minutes = minutes + 1;
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if (minutes > 59) {
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minutes = minutes - 60;
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hours = hours + 1;
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if (hours > 23) {
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hours = hours - 24;
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days = days + 1;
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}
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} else {
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if (hours > 23) {
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hours = hours - 24;
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days = days + 1;
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}
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}
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} else {
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if (minutes > 59) {
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minutes = minutes - 60;
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hours = hours + 1;
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if (hours > 23) {
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hours = hours - 24;
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days = days + 1;
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}
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} else {
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if (hours > 23) {
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hours = hours - 24;
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days = days + 1;
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}
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}
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}
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// Converting each integer value of String and combining all Strings.
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String finalTime = String.valueOf(days) + ":" + String.valueOf(hours) + ":" + String.valueOf(minutes)
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+ ":" + String.valueOf(seconds);
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System.out.println("New time is :\n" + finalTime);
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System.out.println("OR");
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System.out.println(days + " Days " + hours + " Hours " + minutes + " Minutes " + seconds + " Seconds ");
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} else {
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System.out.println("Time is not valid.");
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}
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} finally {
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if (input != null) {
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input.close();
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}
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}
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}
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private static boolean isTimeValid(String time) {
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boolean result = false;
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/*
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* Regular expression that matches String with format HH:mm:ss
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* HH -> 0-23
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* mm -> 0-59
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* ss -> 0-59
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*/
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String pattern = "(0?[0-9]|1[0-9]|2[0-3]):(0?[0-9]|[1-5][0-9]):(0?[0-9]|[1-5][0-9])";
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if (time.matches(pattern)) {
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result = true;
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}
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return result;
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}
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}

‎AdditionInDate.java

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package date;
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import java.text.DateFormat;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.Calendar;
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import java.util.Date;
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import java.util.Scanner;
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/**
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*
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* @author Rohit Agarwal
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* @category Date and Time
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* @problem Addition in given Date
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*
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*/
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public class AdditionInDate {
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public static final String NEW_DATE_PATTERN = "MMM. dd yyyy, EEEE";
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public static void main(String[] args) {
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Scanner input = null;
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try {
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input = new Scanner(System.in);
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System.out.println("Enter date in dd/MM/yyyy format :");
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String date = input.next();
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// If Date is valid, converting String to date.
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Date mydate = getValidDate(date);
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if (mydate != null) {
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System.out.println("Enter how many years you want to add? : ");
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int years = input.nextInt();
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System.out.println("Enter how many months you want to add? : ");
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int months = input.nextInt();
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System.out.println("Enter how many weeks you want to add? : ");
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int weeks = input.nextInt();
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System.out.println("Enter how many days you want to add? : ");
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int days = input.nextInt();
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// Creating Calendar class instance.
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Calendar calendar = Calendar.getInstance();
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// Converting Date to Calendar
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calendar.setTime(mydate);
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// Adding years to Calendar date.
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calendar.add(Calendar.YEAR, years);
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// Adding months to Calendar date.
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calendar.add(Calendar.MONTH, months);
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// Adding weeks to Calendar date.
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calendar.add(Calendar.DAY_OF_WEEK_IN_MONTH, weeks);
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// Adding days to Calendar date.
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calendar.add(Calendar.DAY_OF_MONTH, days);
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// Converting Calendar to Date.
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Date newDate = calendar.getTime();
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DateFormat format = new SimpleDateFormat(NEW_DATE_PATTERN);
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String myNewDate = format.format(newDate);
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System.out.println("New Date : " + myNewDate);
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} else {
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System.out.println("Dates are invalid.");
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}
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} finally {
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if (input != null) {
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input.close();
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}
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}
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}
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private static Date getValidDate(String date) {
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Date mydate = null;
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if (isValidDateFormat(date)) {
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/**
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* d -> Day of month
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* M -> Month of year
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* y -> Year
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*/
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DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
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/**
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* By default setLenient() is true. We should make it false for
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* strict date validations.
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*
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* If setLenient() is true - It accepts all dates. If setLenient()
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* is false - It accepts only valid dates.
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*/
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dateFormat.setLenient(false);
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try {
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mydate = dateFormat.parse(date);
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} catch (ParseException e) {
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mydate = null;
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}
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}
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return mydate;
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}
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private static boolean isValidDateFormat(String date) {
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/**
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* Regular Expression that matches String with format dd/MM/yyyy.
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* dd -> 01-31
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* MM -> 01-12
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* yyyy -> 4 digit number
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*/
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String pattern = "(0?[1-9]|[12][0-9]|3[01])\\/(0?[1-9]|1[0-2])\\/([0-9]{4})";
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boolean result = false;
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if (date.matches(pattern)) {
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result = true;
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}
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return result;
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}
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}

‎CalculateAge.java

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package date;
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import java.text.DateFormat;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.time.Instant;
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import java.time.LocalDate;
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import java.time.Period;
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import java.time.ZoneId;
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import java.util.Date;
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import java.util.Scanner;
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/**
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*
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* @author Rohit Agarwal
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* @category Date and Time
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* @problem How to calculate age?
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*
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*/
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public class CalculateAge {
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public static void main(String[] args) {
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Scanner input = null;
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try {
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input = new Scanner(System.in);
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System.out.println("Enter your DOB in dd/MM/yyyy format :");
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String dob = input.next();
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Date current = new Date();
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// If Date is valid, converting String to date.
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Date mydob = getValidDate(dob);
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if (mydob != null && mydob.before(current)) {
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// Get default Time zone Id.
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ZoneId defaultZoneId = ZoneId.systemDefault();
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// Convert Date mydob to LocalDate
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Instant instant1 = mydob.toInstant();
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LocalDate localeDateMyDob = instant1.atZone(defaultZoneId).toLocalDate();
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// Convert Date current to LocalDate
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Instant instant2 = current.toInstant();
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LocalDate localeDateCurrent = instant2.atZone(defaultZoneId).toLocalDate();
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Period period = Period.between(localeDateMyDob, localeDateCurrent);
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System.out.println("Age : " + period.getYears() + " Years " + period.getMonths() + " Months "
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+ period.getDays() + " Days");
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} else {
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System.out.println("DOB is invalid.");
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}
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} finally {
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if (input != null) {
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input.close();
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}
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}
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}
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private static Date getValidDate(String date) {
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Date mydate = null;
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if (isValidDateFormat(date)) {
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/*
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* d -> Day of month M -> Month of year y -> Year
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*/
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DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
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/*
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* By default setLenient() is true. We should make it false for
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* strict date validations.
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*
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* If setLenient() is true - It accepts all dates. If setLenient()
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* is false - It accepts only valid dates.
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*/
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dateFormat.setLenient(false);
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try {
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mydate = dateFormat.parse(date);
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} catch (ParseException e) {
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mydate = null;
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}
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}
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return mydate;
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}
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private static boolean isValidDateFormat(String date) {
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/*
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* Regular Expression that matches String with format dd/MM/yyyy.
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* dd -> 01-31
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* MM -> 01-12
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* yyyy -> 4 digit number
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*/
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String pattern = "(0?[1-9]|[12][0-9]|3[01])\\/(0?[1-9]|1[0-2])\\/([0-9]{4})";
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boolean result = false;
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if (date.matches(pattern)) {
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result = true;
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}
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return result;
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}
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}

‎ChangeTimezone.java

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package date;
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import java.text.DateFormat;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.TimeZone;
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public class ChangeTimezone {
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public static void main(String[] args) throws ParseException {
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//Get Current date.
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Date date=new Date();
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//Get default Time zone.
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TimeZone timezone=TimeZone.getDefault();
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System.out.println("Time Zone : "+timezone.getID() + " | "+timezone.getDisplayName() );
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/*
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* d -> Day of month
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* M -> Month of year
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* Y -> Year
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* h -> Hour (1-12)
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* m -> minute
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* s -> second
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* a -> AM/PM
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* z -> Time zone
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*/
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DateFormat format=new SimpleDateFormat("dd/MM/yyyy hh:mm:ss a z");
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String dateInString=format.format(date);
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System.out.println("Current date in IST : " +dateInString);
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timezone=TimeZone.getTimeZone("Europe/London");
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System.out.println("Time Zone : "+timezone.getID() + " | "+timezone.getDisplayName() );
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format.setTimeZone(timezone);
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dateInString=format.format(date);
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System.out.println("Current date in GMT : " +dateInString);
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timezone=TimeZone.getTimeZone("America/New_York");
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System.out.println("Time Zone : "+timezone.getID() + " | "+timezone.getDisplayName() );
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format.setTimeZone(timezone);
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dateInString=format.format(date);
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System.out.println("Current date in EST : " +dateInString);
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}
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}

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